package com.bwie.filter;

import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @description :
 * @Author QiHainan
 * @Create 2025/5/21 18:59
 * @Version 1.0
 */
@Configuration
@Order(-1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath().toString();

        if(url.contains("login")){
            System.out.println("登录白名单："+url);
            return chain.filter(exchange);
        }

        String token = request.getHeaders().getFirst("token");
        if(token == null){
            System.out.println("token为空："+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Integer userId = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody().get("userId", Integer.class);
        String tokenKey = "token-"+userId;
        String redisToken = redisTemplate.opsForValue().get(tokenKey);

        if(redisToken == null){
            System.out.println("token失效："+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        if(!redisToken.equals(token)){
            System.out.println("token错误："+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        redisTemplate.expire(tokenKey,15, TimeUnit.MINUTES);

        System.out.println("放行："+url);
        return chain.filter(exchange);
    }
}
